Drying apparatus



Aug. 30, 1938.. J. ETTL DRYING APPARATUS 'Original FiledMay 22, 1936 2 Sheets-Sheet l I INVENTOR I ATTORNEYS Aug. 30, 1938.

J. ETTL 1 DRYING APPARATUS 2 Sheets-Sheet' 2 Original Filed May 22, 1936 Patented Aug. 30, 1938 UNITED STATES new 2,128,698 DRYING APPARATUS Joseph Ettl, Plainfield, N. J., assignor to Potdevin Machine Company, Brooklyn, N. Y., a

corporation of New York Original application May 22, 1936, Serial No. 81,251. Divided and this application February 20, 1937, Serial No. 126,755

3 Claims. (01.126-99) This invention relates to drying apparatus, the present application being particularly directed to a heater for heating the air which is to be circulated through the drying chamber or oven for :the purpose of drying or heating articles or materials passed through the oven on conveyors. The invention provides an apparatus involving a. novel arrangement of parts whereby complete and uniform drying or heating of articlesor materials may readily be accomplished.

The present application is a division of my copending application Serial No. 81,251, filed May" 22, 1936, the .claims herein being particur larl'y' directed to the heater or heating chamber. 3 In the accompanying drawings:

Fig. 1 is a plan view of my improved apparatus partly broken away to expose the interior construction Fig. 2 is a section taken on the line 2-2 of Fig. 1;

Fig; 3 is a section taken on the line 33' of Fig Fig. 4 isa section through the heater on the line 4-4 of Fig. 3;

Figs. 5 and 6 are, respectively, plan and sectional views of a modified form of heater or heat generating chamber.

Referring to the drawings in detail: I designates a heat chamber whereinair is heated, the 30z heatedthen being passed to a drying chamber or oven 2 which is in communication with the heat chamber. The heat chamber and oven may be supported on suitable girders or platform 3 suspended from the ceiling d by means. of struts 35 5, or the equipment may be mounted in any other suitable fashion.

The heat chamber or heater I is provided with a combustion compartment, designated 6, and provided with a plurality of burners l.

The roof or top wall of this combustion compartment is designated R and as will be seen from Fig. 4, for instance, is shaped to provide a plurality of fines 8, 9, lil, II and I2, a flue being provided directly above each burner.

Within theheat chamber I is a pair of horizontally extending spaced walls I 3 and I4, the space between these walls communicating at one side of the chamber with the space between a pair of vertically extending walls l5 and i6, and at 50 the other side with the space between another pair of vertical Walls ll and I8. Exhaust pipes or ducts l9 and 20, respectively, lead from the space between the walls I 5 and I6 and the space between the walls ll and-I8.

The central flue ll], of the group of flues above mentioned, extends above the horizontally extending wall It and is provided with laterally extending flues or conduits I ll extending. into the space between the walls I3 and I4.

The upper ends of the fiues 8, 9, I I and. l2 have short pipes 26 projecting upwardly into the space between the walls I3 and M. It is through the pipes or conduits I ii and 26 that the products of combustion pass from the combustion chamber 6 into the compartment formed bythe spaced walls 13 and It, the products of combustion in. this bustion in'the drying chamber oroven 2 due 'tothe gases and impurities it contains; consequent- 1y,- the exhaust ducts I9 and lead to waste or, if desired, the products of combustion pass ing there-through may be re-circulated in the heat chamber 6.

The air which is employed and utilized in the drying chamber or oven is fresh, clean' air which is heated by circulating the same in contact-with the outside walls of the flues 8, 9, Hi, II and I2 and the walls I3, It" and ill of the heater compartment.

Extending downwardly from the wall 4 between the flues 8, 9 and the flues II, I2 I provide baffles 22 and 23. I also provide bafiles 2| extending downwardly from the top wall 25 of the chamber I between the flues' 9 and I0 and between the flues l0 and II. These bailles are provided with openings 24 adjacent their upper. ends to accommodate the lateral extension ID of the flue ID, as will be seen from Fig. l, for instance.

The drying air is re-circulated from the drying chamber or oven 2 by means of a blower driven by a motor 3i, this blower being located in blower housing 32 communicating with the heating chamber I through a conduit formed by vertical walls 33 and 3 8, which conduit communicates with the intake conduit 35 of Fig. 4.

Auxiliary air inlet 36 is located in the intake conduit 35 for the admission of fresh auxiliary air to the heating chamber. This auxiliary air inlet is controlled by a manually operated damper 3i.

The air entering the intake conduit travels downwardly between the baffles 2| where it is divided by the flue It so that part of the air will flow to the right and part to the left of the chamber, as viewed in Fig. 4. This air will pass in a staggered path between the downwardly extending bafiles 22 and 23 and the upwardly extending flues 8, 9, H and I2 in the direction of the arrows shown in Fig. 4, the air on one side passing upwardly between the walls l6 and and on the other side between the walls l8 and 4| to outlet conduit 42 which in turn communicates with the drying chamber or oven 22.

While the claims of this application are limited to the heater above described, I will briefly, for the purposes of clarity, describe the construction of the drying oven and the circulation of air from the heater through the oven, etc.

The drying chamber 2 receives the heated air from the heating chamber I through the outlet conduit 42, above referred to. This conduit communicates with a longitudinally extending conduit provided with a plurality of spaced openings 5| in the bottom wall or partition 52 thereof. Below the partition 52 is another wall or partition 53 and the space between the partitions 52 and 53 I shall call an equalizing chamber, the air being evenly distributed therein. The partition 53 is provided with a plurality of transversely extending spaced slots 54.

The air passing from the outlet conduit 42 enters the space between the walls or partitions 52 and 53 through the spaced openings 5| which serve to distribute the air evenly, the air passing from this space to the drying compartment or oven 58 through the slots 54, each of which supports screens which further evenly distribute the air beforethe same is directed upon articles on the conveyor 56.

The heated air after it passes the conveyor is drawn through conduits 60 and 6| back to the blower housing 32 where it is again circulated through the heater. The modified form of heater illustrated in Figs. 5 and 6 likewise provides a long irregular path for the'air being heated. In this form the air enters the chamber through inlet conduit 10 and passes around flues 1|, 72, 73, 74 and 75 and thence to the drying chamber through outlet conduit 16.

11, 18, 19, and 8| designate burners for the flues 1|, 12, l3, l4 and 15, respectively.

The products of combustion from the flues pass through the conduit 80 formed by the horizontally extending spaced walls 8|, 82 to the conduit formed by the vertically extending spaced walls 83, 84 and out through exhaust outlet 85.

What I claim is:-

1. In apparatus of the class described, a heater comprising a combustion compartment, a plurality of vertically extending flues extending upwardly from the combustion compartment toward the top of said heater, vertically extending bafiles between said fiues, the spaces between said flues and ballles providing a staggered path for the passage of air through the heater out of contact with the products of combustion from the combustion compartment, spaced walls above said fiues, conduits connecting said fiues with the spacebetween said walls, said space communicating with the exterior of the heater for the exhaust of products of combustion from said flues, the air after traversing said staggered path of said heater.

2. In apparatus of the class described, a heater comprising a combustion compartment, vertically extending side and central fiues, spaced walls above said fiues, said vertically extending side lines each having a vertically extending conduit communicating with the space between said walls, said central flue having transverse passages communicating with the space between said walls, and exhaust ducts from the space between said walls to the exterior of the heater.

3. In apparatus of the class described, a heater comprising a combustion compartment, vertically extending side and central fiues, spaced walls above said flues, said vertically extending side flues each having a vertical conduit communicating with the space between said walls, said vertical central flue having transverse passage communicating with the said space, exhaust ducts leading from the space between said walls to the exterior of the heater, the products of combustion from the combustion compartment passing through said flues and between said spaced walls to said exhaust ducts, and baffles extending from one of said walls downwardly between adjacent flues to effect the passage in a staggered path of air passing through the heater along the outside of said fiues and spaced walls.

JOSEPH E'I'I'L. 

